Wow... it's almost like it's not feature-complete. Like it's part of some kind of... alpha test or something.
Yeah, it is "pre-alpha" or whatever they say. Other games that are in the alpha stage have been properly tested on different hardware before being released. That way, everyone can play the game comfortably without having to change their setup. Star Citizen basically just unloaded this *late* alpha version without any quality control.
Why would you expect Star Citizen to work correctly on your setup during alpha? Maybe it's because they have tons of resources, so they should be able to do test the game on crossfire and SLI. Like I said, people paid good money to get an unfinished game; that doesn't mean the unfinished game does not have to work. Developers should make sure the game works well on many different setups, EVEN IF it is only in "pre-alpha"
That graphical problem you're having is caused by an incompatibility with SLI. Turn off SLI and it should work fine.